Those are some really nice looking roads, though they're much wider, less tight, and better maintained than most UK country roads. I'd love to take my ER6 over there and try them out, I especially love how there's very little traffic on them (other than the slow-moving cars). My favourite new hobby, as a matter of fact, is over-taking stuff. My bike absolutely loves it, I only have to
think about overtaking stuff and he immediately starts revving faster. I suddenly realise why I see so many bikers overtaking cars on country roads; the acceleration is just so fantastically massive that if you
don't overtake cars, you're practically committing a crime. Got upto 80pmh on a stretch of country road here today (before I had to slow for a bend), I'm going to try and push it to 90 tomorrow. Of course, I could quite easily just get on the motorway and do it, but I hate those. Stupid cross-winds. -__-
Have you prepared yourself for how different the riding position will be on the Monster compared to cruisers? You might find long-distance riding to be a little more uncomfortable.

Also, I would recommend All The Gear, All The Time. When I was out on my little 125 cruiser I would often just wear standard jeans instead of my leathers, because it had a top speed of like.... 65 and the seat was only like 2 inches off the ground. Now, even if I'm just going out for 5 minutes, I kit up fully, because I can fall from much higher at a much faster speed (although to be fair, I fully anticipate falling off at very slow speeds, owing to shortness of legs. Staying upright at speed is the easy part).